Aeronautical clinometer



, 8. SANFORD.

AERONAUTICAL CLINOMETER.

APPLICATION FILED JULY 14. 1919.

1,377,442. Patented May 10, 1921.

4Ira/MEK SYDNEY J. SANFORD, or LOS ANGELES, CALIFORNIA.

AERONAUTICAL CLVINOM'ETER.

: Specifieation of Letters Patent.

"Patented Ma 10, 1921.

Application filed July 14, 1919. Serial no. 310,697.

To allevho'm it may concern 7 Be it known that I, SYDNEY J SANFORD, a citizen of Canada, residing at Los Angeles, in the county of'Los Angeles and State of California, have invented a new and useful Aeronautical Clinometer, of which the following is a specification.

The principal object of tion is to enable the driver or pilot of an aeroplane to ascertain, at all times both by 1 night and by day, the angle in respect to the horizon at which his machine maybe tipped in any direction; that 1s,'to ascertaln the angle of ascent, descent or sidewise tilt, and

anotherobject of the invention is to pro-' vide an illuminated aeronautical clinometer which can be readily adjusted and which is well adapted'to meet the requirements of use in connection with an aeroplane. Other objects as well as thena'ture, characteristic features and scope of the invention will appear from the following description which will be givenin connection with the accom panying draw1ngs, form1ng part hereof, and

in wh1ch- .7 a

Figure 1, is a front view, partly in section, of an aeronautical clinometer embodying features of the invention.

*igJQ, is a side view of the same with parts broken away.

.Fig. 3,is1aview of the underside of the; instrument-looking upward in Fig. 1, and

Fig. 4, is a top or plan View ofthe bowl, shown in Fig. 2, with the superstructure removed. 1

In the drawings 1, is aframe, shown asidepending from the switchboard 2, of an aeroplane or airship. This frame'is provided with feet 3, of which three-"are shown, and

these three feet permit onesi de of the frame, the left-hand side in Fig. '2, to rema1n7openn and unobstructed, and these three feet are useful in connection with the adjustment of the instrumentfas will hereinafterappear.

4, is a carrying ring 'apertur'ed for the-passage of the feet 3, which are adjustably con-' nected with the ring 4, by adjustingnuts 5.

' 6, is a fiber ring carried by the carrying the present inven ring 4:. 7, 'is an opaque reflecting bowl flanged at 8, and likethefiber ring 6, carried by the carrying ring 4.. '9, is a double walled translucent hemispherical or domeshaped container, as of glass. This con tainer 9, is cemented to the fiber ring 6,

and forms with the container a light chamber. j Pads 10, on the container9, facili tate the-cementing operation andone of q these may be the closure" of the opening through which there is introduced into the container a fluid y, Fig. 1, which contains the bubble w. 10, isa light arranged in the light chamber and shown as-mounted through the bowl 7. The connections 11, I

for this light may pass through one of the feet 3, made hollow for this purpose, to the switch 12, on the switch-board.

When the aeroplane is level, themovable fluid spot or air bubble :0, Figs. 1 and 4,00

'cupies a polar position in respect to the spherical ordome; shaped surface of the container 9, and this movable'fiuid spot'or I air bubble moves'freely over that surface to indicate the departure of the aeroplane or airship from its level position in all directions, and the relative movement of the spot and surface may be ascertained by suitable i al andlongitudinal graduations Z a g 1. In an aeronautical clinomet'er the com-t I bination of an opaque bowl, a translucent double walled dome-like container form,-

ing with the bowl a light chamber, a source i of light in said chamber, and lio uid'ha ving a bubble therein provided in the container] and illuminated by the source o f-light to em tainer' consisting entirely of glass and having a sealed closure for aliquid provided phasize the. bubble,v substantially as described. q I a 1 2; In an aeronautical clinometer the combination of a double-walleddome-like con- 9 i in said container and having a bnbble therein, substantially asdeS cribedL I 7 r srD' EY J. sAru onn. 

